989631 has 8 divisors (see below), whose sum is σ = 1466160. Its totient is φ = 659736.

The previous prime is 989629. The next prime is 989641. The reversal of 989631 is 136989.

It is not a de Polignac number, because 989631 - 2¹ = 989629 is a prime.

It is a super-2 number, since 2×989631² = 1958739032322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18300 + ... + 18353.

It is an arithmetic number, because the mean of its divisors is an integer number (183270).

2⁹⁸⁹⁶³¹ is an apocalyptic number.

989631 is a deficient number, since it is larger than the sum of its proper divisors (476529).

989631 is a wasteful number, since it uses less digits than its factorization.

989631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36662 (or 36656 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 989631 is about 994.8019903478. The cubic root of 989631 is about 99.6531651130.

The spelling of 989631 in words is "nine hundred eighty-nine thousand, six hundred thirty-one".